Add sample component with state in RNTester

Summary:
This Diff introduces a Sample component in RNTester which uses the NativeState to load some images.
It is an example on how to use CustomNativeState

In this first diff, I focused on the iOS side of things. The next diff will make this work with Android.

## Changelog
[iOS][Added] - Introduce sample component which work with the native state.

Reviewed By: cortinico

Differential Revision: D39884926

fbshipit-source-id: abff225dbece82534bb472124494b80b298172b7

packages/rn-tester/BUCK

@@ -51,6 +51,7 @@ rn_library(
             "js",
             "NativeModuleExample",
             "NativeComponentExample",
+            "NativeComponentWithState",
             "RCTTest",
         ],
         excludes = [
@@ -85,6 +86,7 @@ fb_native.filegroup(
         ],
         exclude = [
             "NativeComponentExample/**/*",
+            "NativeComponentWithState/**/*",
         ],
     ),
     visibility = ["PUBLIC"],
@@ -321,3 +323,42 @@ rn_xplat_cxx_library2(
         "//xplat/js/react-native-github:RCTFabricComponentViewsBase",
     ],
 )
+
+rn_xplat_cxx_library2(
+    name = "NativeComponentWithState",
+    plugins_only = True,
+    srcs = glob(
+        [
+            "NativeComponentWithState/ios/*.m",
+            "NativeComponentWithState/ios/*.mm",
+            "NativeComponentWithState/ios/*.cpp",
+        ],
+    ),
+    headers = glob(
+        [
+            "NativeComponentWithState/ios/*.h",
+        ],
+    ),
+    header_namespace = "",
+    compiler_flags = [
+        "-fexceptions",
+        "-frtti",
+        "-std=c++17",
+        "-Wall",
+    ],
+    contacts = ["oncall+react_native@xmail.facebook.com"],
+    labels = [
+        "pfh:ReactNative_CommonInfrastructurePlaceholder",
+        "supermodule:xplat/default/public.react_native.infra",
+    ],
+    plugins = [
+        react_fabric_component_plugin_provider("RNTNativeComponentWithStateView", "RNTNativeComponentWithStateCls"),
+    ],
+    plugins_header = "RCTFabricComponentsPlugins.h",
+    reexport_all_header_dependencies = False,
+    visibility = ["PUBLIC"],
+    deps = [
+        ":generated_components-AppSpecs",
+        "//xplat/js/react-native-github:RCTFabricComponentViewsBase",
+    ],
+)

packages/rn-tester/NativeComponentWithState/NativeComponentWithState.podspec

@@ -0,0 +1,38 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+require "json"
+
+package = JSON.parse(File.read(File.join(__dir__, "../" "package.json")))
+
+Pod::Spec.new do |s|
+  s.name            = "NativeComponentWithState"
+  s.version         = package["version"]
+  s.summary         = package["description"]
+  s.description     = "native-component-with-state"
+  s.homepage        = "https://github.com/sota000/my-native-view.git"
+  s.license         = "MIT"
+  s.platforms       = { :ios => "12.4", :tvos => "12.4" }
+  s.compiler_flags  = '-Wno-documentation -Wno-nullability-completeness'
+  s.author          = "Facebook, Inc. and its affiliates"
+  s.source          = { :git => "https://github.com/facebook/my-native-view.git", :tag => "#{s.version}" }
+  s.pod_target_xcconfig    = {
+    "HEADER_SEARCH_PATHS" => "\"$(PODS_ROOT)/RCT-Folly\" \"$(PODS_ROOT)/boost\" \"${PODS_CONFIGURATION_BUILD_DIR}/React-Codegen/React_Codegen.framework/Headers\"",
+    "CLANG_CXX_LANGUAGE_STANDARD" => "c++17"
+  }
+
+  s.source_files    = "ios/**/*.{h,m,mm,cpp}"
+  s.requires_arc    = true
+
+  install_modules_dependencies(s)
+
+  # Enable codegen for this library
+  use_react_native_codegen!(s, {
+    :library_name => "NativeComponentWithStateSpec",
+    :react_native_path => "../../../",
+    :js_srcs_dir => "./js",
+    :library_type => "components"
+  })
+end

packages/rn-tester/NativeComponentWithState/ios/RNTNativeComponentWithStateCustomComponentDescriptor.h

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <react/renderer/core/ConcreteComponentDescriptor.h>
+#include "RNTNativeComponentWithStateCustomShadowNode.h"
+
+namespace facebook {
+namespace react {
+
+/*
+ * Descriptor for <RNTNativeComponentWithStateCustomComponentDescriptor>
+ * component.
+ */
+class RNTNativeComponentWithStateCustomComponentDescriptor final
+    : public ConcreteComponentDescriptor<
+          RNTNativeComponentWithStateCustomShadowNode> {
+ public:
+  RNTNativeComponentWithStateCustomComponentDescriptor(
+      ComponentDescriptorParameters const &parameters)
+      : ConcreteComponentDescriptor(parameters),
+        imageManager_(std::make_shared<ImageManager>(contextContainer_)) {}
+
+  void adopt(ShadowNode::Unshared const &shadowNode) const override {
+    ConcreteComponentDescriptor::adopt(shadowNode);
+
+    auto compShadowNode =
+        std::static_pointer_cast<RNTNativeComponentWithStateCustomShadowNode>(
+            shadowNode);
+
+    // `RNTNativeComponentWithStateCustomShadowNode` uses `ImageManager` to
+    // initiate image loading and communicate the loading state
+    // and results to mounting layer.
+    compShadowNode->setImageManager(imageManager_);
+  }
+
+ private:
+  const SharedImageManager imageManager_;
+};
+
+} // namespace react
+} // namespace facebook

packages/rn-tester/NativeComponentWithState/ios/RNTNativeComponentWithStateCustomShadowNode.cpp

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "RNTNativeComponentWithStateCustomShadowNode.h"
+
+#include <react/renderer/core/LayoutContext.h>
+
+namespace facebook {
+namespace react {
+
+extern const char RNTNativeComponentWithStateComponentName[] =
+    "RNTNativeComponentWithState";
+
+void RNTNativeComponentWithStateCustomShadowNode::setImageManager(
+    const SharedImageManager &imageManager) {
+  ensureUnsealed();
+  imageManager_ = imageManager;
+}
+
+void RNTNativeComponentWithStateCustomShadowNode::updateStateIfNeeded() {
+  const auto &newImageSource = getImageSource();
+
+  auto const &currentState = getStateData();
+
+  auto imageSource = currentState.getImageSource();
+
+  bool anyChanged = newImageSource != imageSource;
+
+  if (!anyChanged) {
+    return;
+  }
+
+  // Now we are about to mutate the Shadow Node.
+  ensureUnsealed();
+
+  // It is not possible to copy or move image requests from SliderLocalData,
+  // so instead we recreate any image requests (that may already be in-flight?)
+  // TODO: check if multiple requests are cached or if it's a net loss
+  auto state = RNTNativeComponentWithStateState{
+      newImageSource,
+      imageManager_->requestImage(newImageSource, getSurfaceId())};
+  setStateData(std::move(state));
+}
+
+ImageSource RNTNativeComponentWithStateCustomShadowNode::getImageSource()
+    const {
+  return getConcreteProps().imageSource;
+}
+
+void RNTNativeComponentWithStateCustomShadowNode::layout(
+    LayoutContext layoutContext) {
+  updateStateIfNeeded();
+  ConcreteViewShadowNode::layout(layoutContext);
+}
+
+} // namespace react
+} // namespace facebook

packages/rn-tester/NativeComponentWithState/ios/RNTNativeComponentWithStateCustomShadowNode.h

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <jsi/jsi.h>
+#include <react/renderer/components/AppSpecs/EventEmitters.h>
+#include <react/renderer/components/AppSpecs/Props.h>
+#include <react/renderer/components/AppSpecs/States.h>
+#include <react/renderer/components/view/ConcreteViewShadowNode.h>
+
+#include <react/renderer/imagemanager/ImageManager.h>
+#include <react/renderer/imagemanager/primitives.h>
+
+namespace facebook {
+namespace react {
+
+JSI_EXPORT extern const char RNTNativeComponentWithStateComponentName[];
+
+/*
+ * `ShadowNode` for <Slider> component.
+ */
+class RNTNativeComponentWithStateCustomShadowNode final
+    : public ConcreteViewShadowNode<
+          RNTNativeComponentWithStateComponentName,
+          RNTNativeComponentWithStateProps,
+          RNTNativeComponentWithStateEventEmitter,
+          RNTNativeComponentWithStateState> {
+ public:
+  using ConcreteViewShadowNode::ConcreteViewShadowNode;
+
+  // Associates a shared `ImageManager` with the node.
+  void setImageManager(const SharedImageManager &imageManager);
+
+  static RNTNativeComponentWithStateState initialStateData(
+      ShadowNodeFragment const &fragment,
+      ShadowNodeFamilyFragment const &familyFragment,
+      ComponentDescriptor const &componentDescriptor) {
+    auto imageSource = ImageSource{ImageSource::Type::Invalid};
+    return {imageSource, {imageSource, nullptr}};
+  }
+
+#pragma mark - LayoutableShadowNode
+
+  void layout(LayoutContext layoutContext) override;
+
+ private:
+  void updateStateIfNeeded();
+
+  ImageSource getImageSource() const;
+
+  SharedImageManager imageManager_;
+};
+
+} // namespace react
+} // namespace facebook

packages/rn-tester/NativeComponentWithState/ios/RNTNativeComponentWithStateView.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import <React/RCTViewComponentView.h>
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RNTNativeComponentWithStateView : RCTViewComponentView
+
+@end
+
+NS_ASSUME_NONNULL_END